4 Wiring
29
6. Voltage drop should be considered when determining the
wire size.
Voltage drop can be calculated using the following equa-
tion:
Phase-to-phase voltage drop (V)
=
×
Wire resistance (
Ω
/km)
×
Wiring distance (m)
×
Current
(A)
×
10
-3
Select a wire size so that voltage drop will be less than 2%
of the normal rated voltage.
7. If the Inverter is connected to a power transformer exceed-
ing 600 kVA, excessive peak current may flow into the
input power supply circuit, and break the converter sec-
tion. In this case, attach an AC reactor (optional) to the
Inverter input side, or a DC reactor (optional) to the DC
reactor connection terminal.
Wire and Terminal Screw Sizes
1. Control Circuits
Model
Terminal
Symbols
Screws
Tightening
Torque
N
•
m (lb
•
in)
Wires
Applicable Size
Recom-
mended Size
Type
mm
2
AWG
mm
2
AWG
Same
for all
models
MA, MB, MC
M3
0.5 to 0.6
(4.44 to 5.33)
Twisted wires:
0.5 to 1.25,
Single: 0.5 to 1.25
20 to 16,
20 to 16
0.75
18
Shielded or
equivalent
S1 to S7, P1,
P2, SC, PC,
R+, R-, S+, S-,
FS, FR, FC,
AM, AC, RP
M2
0.22 to 0.25
(1.94 to 2.21)
Twisted wires:
0.5 to 0.75,
Single: 0.5 to 1.25
20 to 18,
20 to 16
0.75
18
3
